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Another hanging idle (gs450l)

  • Thread starter Thread starter Vantreeseba
  • Start date Start date
Vantreeseba, you don't need to do anything to satisfy me. I'm just trying to help. If you do indeed have a hanging idle, you most likely have a vacuum leak as suggested by Nessism and well described in the FactoryPro site I gave you earlier. Read that last section again. A lean condition gets better as the bike warms up. But a vacuum leaks is easier to test than pulling your carbs so you should check that first. Start with the factory settings for the idle mixture screws, maybe plus 1/2 turn. Otherwise you may be masking the problem. Good luck.
 
Nessism said:
A getto sync job can be performed by setting the idle up to 2500 rpm or so, and then pull one spark plug cap off and seeing where the idle settles. Repeat for second cylinder. Adjust the sync so the idle speed drop is the same for both cylinders.
Click to expand...

Vantreeseba said:
@Nessism the only thing on that list is the carb sync I'm not sure of, I bench-synched them, but I don't have a manometer atm.

Thanks for the help guys, I'm still not sure what the root cause is, but if I figure it out, I will let everyone know.
Click to expand...

You can not diagnose running problems unless all the basic maintenance is complete. You might want to check the Newbie Mistakes thread linked in my signature to see if anything clicks.
 
@AJ, sorry I didn't mean to sound snooty or anything, "satisfy" is just a term we use in the software world to say that "our product does what it should", so I meant that as "I will test it and make sure its working". I really do appreciate the help.

@Nessism. You're totally correct, I've just been messing with this thing forever and kind of want to just get out and ride, but I need to stop being lazy and cover ALL the bases before I try to make any kind of assumption about the whole system. So before I go any further on trying to figure this out, I will do a valve adjustment and then do a vacuum sync, and see where we are from there. That, and the previous work I've done, should cover all the things in the "newbie mistakes" guide, and the basic maintenance guide from bikecliff.

Thanks again.
 
I did do something that was silly, and now thats its mostly fixed, the bike seems to run better.

The choke return spring (not the ones inside the carbs, but the one on the "bar") was not on correctly, so the choke was not returning all the way, strange thing is, that it only moves like 1/8 an inch, but when pushed all the way closed, my bike idles and runs fine, but if I just slightly tug it out, at most 1/8 an inch, the bike bogs and drops like 2-300 rpm. Its really strange.

Anyhow, I will keep working on it and checking the things mentioned in this thread, and update as I discover strange things :P.
 
Yea, so I tore my bike down to double check all the electrical connections, since one of the ground wires was ugly and crinkled (the connection from starter relay to ignition coil gnd). I still haven't done the valve adjustment or carb sync, but those are coming.

I seem to have fixed the issue with the hanging idle though.
The choke cable was "bent" at the end, I figured it was "no big deal" since it was a cable and a bend shouldn't effect it too much. Well, I was wrong.

The bend was keeping the choke from closing completely, which of course caused issues. I've ridden up and down the street again after adjusting the idle and resetting the mixture screws, and it seems to be running good.

Once again, double check silly mechanical things before trying to diagnose more complicated problems :|.
 
Sorry to dig up an old thread, but I finally got it running much better, turns out, you can't always trust what a jet says on the size of it.

I had gotten a spare set of carbs from a gs450ga, and the carbs are, as much as I can tell, identical, except for the pilot circuit. So the original pilot jet from the gs450lf carbs is a smooth bodied jet (no holes except for the end), stamped with 45. The gs450ga is a "aerated" jet, stamped with a 45. If you look at the actual output aperature, the gs450lf is obviously visibly much larger, like twice the size compared to the gs450ga pilot jet.

So, I of course, swapped back in the original torn up jets, and she is purring right along.

In short, make sure you are using the right parts :P
Now to stop being lazy and finish the rest of the checklist.

So AJ it turns out your thoughts that the pilot circuit was clogged was correct, except it wasn't gunk or anything that was clogging it, it was the smaller jet :F
 
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